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• Top level
• • classification B

  • classification B1 (101 biblios)	classification B2 (42 biblios)	classification B3 (53 biblios)
    classification B4 (15 biblios)	classification B5 (41 biblios)	classification B6 (5 biblios)
    classification B7 (21 biblios)	classification B8 (39 biblios)	classification B9 (10 biblios)
    classification BC (54 biblios)	classification BD (105 biblios)	classification BF (2565 biblios)
    classification BH (13 biblios)	classification BJ (251 biblios)	classification BL (247 biblios)
    classification BM (4 biblios)	classification BP (87 biblios)	classification BQ (2498 biblios)
    classification BR (27 biblios)	classification BS (12 biblios)	classification BT (11 biblios)
    classification BV (31 biblios)	classification BX (11 biblios)